I forgot the PROTOCOL we put in place
after the great ear infection of '06.
The Big Bang Theory Season 1, Episode 11
Do you honestly expect me to believe
social PROTOCOL dictates...
The Big Bang Theory Season 2, Episode 19
Social PROTOCOL does, however...
The Big Bang Theory Season 4, Episode 22
...scientifically valid PROTOCOL
that will make our lives better?
The Big Bang Theory Season 3, Episode 3
Red PROTOCOL, sealing the doors.
I repeat,
Money Heist Season 3, Episode 3